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The "ideal template" is precisely for the whole car. A car pushing it's way through still air needs to be considered for the car in total. Once the front of the car has started to move air in all directions, any subsequent portions of the car that come along have to be considered in the context of air that is already moving in one direction or another.
So, no one piece of the car is standing alone, and the template has to be for the whole car; not individual pieces of it. Hucho is a good place to look at how specific areas work in relation to the whole.
I'm a little unclear on your question -- is my answer making sense?
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